Chapter 38 review

The uses of dental images include the detection of

• incipient occlusal lesions

• abnormalities in surrounding hard and soft tissues.

• periodontal probing depths.

• percussion sensitivity as part of endodontic evaluation.

Exposure to radiation

• no matter how small, has the potential to cause harmful biological changes

• has a threshold, below which exposure is entirely safe.

• is safer when there is a single, large dose rather than a series of smaller doses.

• from a dental x-ray machine does not involve particulate radiation and is completely safe.

The x-ray was discovered in 1895 by

• John Greenwood.

• Wilhelm Conrad Roentgen.

• Edmund Kells.

• G.V. Black.

The dentist who is credited making the first dental radiograph in 1895 is

• Wilhelm Conrad Roentgen.

• Otto Walkhoff.

• John Greenwood.

• G.V. Black.

Which of the following is the basic form of matter?

• A proton

• A solid

• An atom

• A photon

Which of the following statements is true concerning the structure of the atom?

• The nucleus contains protons and electrons.

• Electrons have no weight or mass.

• The orbital path of an electron around the nucleus is called an electron shell.

• Electrons are unstable in their orbits and shift freely.

In dentistry, the .............. the wavelengths of the x-rays, the greater their energy and their usefulness.

Selected:

• straighter

• more ionized

• longer

• shorter

The component of the x-ray machine that functions in positioning the tubehead is the

• extension arm.

• cathode.

• kilovoltage selector.

• control panel.

The heart of the x-ray generating system is the

• x-ray tube.

• position indicator device.

• transformer.

• insulating oil.

Secondary radiation.........

• Is often referred to as the useful beam.

• is often referred to as the primary beam.

• is a form of radiation that occurs when an x-ray beam has been deflected from its path by interaction with matter.

• refers to x-radiation that is created when the primary beam interacts with matter.